<template>
    <div class="login_container">
    <div class="login_box">
        <!--头像区域-->
        <div class="avatar_box">
            <img class="img" src="../assets/logo.png" alt="">
        </div>
        <!--登录表单区域-->
        <el-form label-width="0px" ref="loginRef" :model="loginForm" :rules="loginrules" class="login_form">
            <!--用户名-->
            <el-form-item prop="username">
                <el-input prefix-icon="el-icon-user" v-model="loginForm.username"></el-input>
            </el-form-item>
            <!--密码-->
            <el-form-item prop="password">
                <el-input type="password" prefix-icon="el-icon-key" v-model="loginForm.password"></el-input>
            </el-form-item>
            <!--按钮-->
            <el-form-item class="btns">
                <el-button type="primary" @click="DoLogin">登录</el-button>
                <el-button type="info" @click="resetLogin">重置</el-button>
            </el-form-item>
        </el-form>
    </div>
    </div>
</template>

<script>
export default {
  data () {
    return {
      // 这是登录表单的数据绑定对象
      loginForm: {
        username: 'admin',
        password: '123456'
      },
      loginrules: {
        username: [
          { required: true, message: '请填写用户名！', trigger: 'blur' },
          { min: 3, max: 10, message: '长度应在 3 - 10 位', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入登录密码！', trigger: 'blur' },
          { min: 6, max: 15, message: '长度应在 6 - 15 位', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    // 点击重置按钮重置表单
    resetLogin() {
      this.$refs.loginRef.resetFields()
    },
    DoLogin() {
      this.$refs.loginRef.validate(async valid => {
        if (!valid) return
        const { data: result } = await this.$http.post('login', this.loginForm)
        // console.log(result)
        if (result.meta.status !== 200) return this.$message.error('登录失败')
        this.$message.success('登录成功！')
        // 登录后：
        /**
         * 1.将登录成功后的token保存在客户端的sessionStorage中，token只在网站打开期间有效
         * 2.项目除了登录的其他API接口必须在登录后才能访问
         */
        window.sessionStorage.setItem('token', result.data.token)
        // 通过编程式导航跳转到home页
        this.$router.push('/home')
      })
    }
  }
}
</script>

<style lang="less" scoped> /*scoped指样式只作用于当前组件*/
.login_container{
    background-color:#2b4b6b ;
    height: 100%;
}
.login_box{
    width: 450px;
    height: 300px;
    background-color: #fff;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%,-50%);
    border-radius: 5%;
    box-shadow: 0 0 10px #000;
}
.avatar_box{
    height:130px;
    width:130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left:50%;
    transform: translate(-50%,-50%);
    background-color: #fff;
}
.img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
    }
.btns{
    display:flex;
    justify-content: flex-end;
}
.login_form{
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}
</style>
